Transcript for Elizabeth Warren faces attacks in Democratic debate
Washington the Democrats were in Ohio last night for their latest debate. 12 candidates on the stage. The most yet and so many took aim at the new front-runner, Elizabeth Warren. The speaking time tells the story, Warren five minutes more than her closest rival as she was forced to defend herself against 16 separate attacks. Warren drawing attacks and Bernie Sanders returning to the stage after suffering from that heart attack. ABC's linsey Davis is in westerville, Ohio, with all the highlights. Good morning, linsey. Reporter: Hey, good morning to you, Michael. Certainly some fiery exchanges on the campus here last night, again and again we saw pile-ons on senator Elizabeth Warren. Meanwhile mayor Pete buttigieg was on the offense. Some candidates saw last night as a do or die moment and some did and other campaigns seemed to die. Overnight, Elizabeth Warren stood center stage rising in the polls and now under attack from her rivals. Senator Warren is more focused on being punitive or pitting some part of the country against the other. Reporter: The Massachusetts senator also facing tough unanswered questions about her health care plan. Will you raise taxes on the middle class for -- to pay for it, yes or no? So, I have made clear what my principles are here and that is costs will go up for the wealthy and for big corporations and for hard working middle class families costs will go down. Yes or no question that didn't get a yes or no answer. But this is why people here in the midwest are so frustrated with Washington in general and capitol hill in particular. Reporter: Mayor Pete buttigieg and Amy klobuchar pounced. At least Bernie is being honest here and saying how he's going to pay for this and that taxes are going to go up and I'm sorry, Elizabeth, but you have not said that and I think we owe it to the American people to tell them where we're going to send the invoice. Reporter: Warren swiped back at the field on the issue of income inequality. My question is not why do Bernie and support a wealth tax, it's why is it does everyone else on this stage thick it is more important to protect billionaires than it is to invest in an entire generation of Americans. Shank you, senator Warren. A reality check to Elizabeth because no one on this stage wants to protect billionaires. Not even the billionaire wants to protect billionaires. Reporter: Vice president Joe Biden trying to take back the spotlight and claimed credit for helping her create an agency to crack down on banks after the financial crisis. I agreed with the great job she did and I went on the floor and got you votes. I got votes for that bill. I convinced people to vote for it so let's get those things straight too. I am deeply grateful to president Obama who fought so hard to make sure that agency was passed into law. Reporter: Biden also facing questions about his son hunter's business dealings with Ukraine, which president trump asked the Ukrainians to investigate despite no evidence of wrongdoing. My son did nothing wrong. I did nothing wrong. I carried out the policy of the United States government in rooting out corruption in, in Ukraine. Reporter: New Jersey senator Cory booker defending Biden calling out the question. The second issue we cover on this stage is elevating a lie and attacking a statesman. That was so offensive. Reporter: Vermont senator Bernie Sanders back on the campaign stage after a heart attack reassuring voters he's got what it take. We are going to be mounting a vigorous campaign all over this country. That is how I think I can reassure the American people. Reporter: A moment of unity on the issue of impeachment. Trump is the most corrupt president in the history of this country. As a former prosecutor I know a confession when I see it. He should be removed. Reporter: The fiercest attacks of the night were reserved for president trump and his recent move to withdraw all U.S. Troops from northern Syria leaving our kurdish allies to fend for themselves against Turkey. This is shameful, shameful what this man has done. This is a crisis of Donald Trump's making and it is on a long list of crises of Donald Trump's making and that's why dude got to go and when I'm in commander in chief we will stop this madness. Reporter: Of the 19 candidates who are running so far only 8 have qualified for next month's debate in Georgia. Now we've also learned that at least two of the congresswomen of the so-called squad including Alexandria ocasio-cortez plan to endorse senator Bernie Sanders for president. Ilhan OMAR as well. Let's get analysis from Jon Karl.
This transcript has been automatically generated and may not be 100% accurate.